For future reference, the page User:Ololoshka562/test.js also seems to have been saved on the Internet Archive

Ah, I can actually reproduce the problem locally with a unit test. This is a bug with QRegularExpression, so it only happens on Qt6 builds currently.

I've also had problems with the report user module thinking a user was not reported at AIV when they really were (several minutes ago). There might be something weird with how my install of HG parses pages in general, almost like it has trouble finding existing content.